Reasonable resistance of supports in deep and steep longwall panels with asymmetric spatial surrounding rock
The 211112 working face in a mine is a typical deep fully mechanized working face with a large dip angle.By taking this working face as the engineering background,the distribution characteristics of spatial surrounding rock structure in deep and steep working faces were expounded systematically.Con-sidering the above distribution characteristics,structural mechanical models of surrounding rock above and below the deep and steep working face were established,respectively,and the qualitative relations regard-ing technical parameters such as weighting step distance and support resistance were obtained.Besides,a FLAC3D numerical model was constructed to reveal the distribution characteristics of the stress field of sur-rounding rock in the deep and steep goaf.Through quantitative analysis on the working resistance of sup-ports in the deep and steep working face in various stages under different working conditions,the method of determining the reasonable working resistance of upper and lower supports in the deep and steep fully mechanized working face was clarified.In the light of this method,the hydraulic support model for the 211112 working face was reasonably selected and successfully applied in the field.
deep miningdeep and steep coal seamroof surrounding rock structureresistance of sup-portsurrounding rock stress field
万方数据
维普
